allow empty value setting #51
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Prior to this PR, there was no way to delete every setting, because then the
valueattribute would be blank, which was forbidden with a validation.This PR removes the
validates_presence_offorvalue.Now it is possible to delete all settings by setting all to
nil.I added a few tests and updated one existing test to reflect the new behaviour.
closes #39
(which addresses the same problem, but without proper tests)